Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

18 posts


Topic # 89194 27-Aug-2011 21:23
Send private message


Recently just moved into a new house and bought a new TV (Samsung 46inch 3D LED one).

The TV has a Freeview tuner in it, so I figured I just need to plug it into the aerial and I'm away. Disappointingly, I plugged it in and the reception is poor, as well as it only picked up 4 channels.

My suspicion is that the aerial plug I used is not the right one, but I thought I would check first as I don't want to break it. here is a picture of the 2 options I have

In addition to my lack of knowledge of the plugs, I thought I would upload a picture of the aerial itself to make sure it is correct too:

And finally, what are those boxes on the aerial here:

My guess is that they are splitters or something like that.

If someone could help with this that would be cool.


Create new topic
6185 posts

Uber Geek
+1 received by user: 1013

Lifetime subscriber

  Reply # 512968 27-Aug-2011 21:38
Send private message

Where do you live?

727 posts

Ultimate Geek
+1 received by user: 7

  Reply # 512969 27-Aug-2011 21:38
Send private message

Images 1 and 3 look the same to me.
I don't know much, but that antenna looks like a high gain UHF antenna to me, so it should do the job.

Where are you? I ask because it may be that DVB-T is not being transmitted from the same place as the earlier UHF analogue signal, or, possibly, the polarisation may be different.

18 posts


  Reply # 512991 28-Aug-2011 01:24
Send private message

Darn it. Here is the first link again, and I'll edit the original post again too:

I'm in Apihai Street Orakei, near Okahu Bay.

I'll have a bit more of a play with the TV and see if I can get it going now.

1508 posts

Uber Geek
+1 received by user: 213

  Reply # 513015 28-Aug-2011 09:18
Send private message

Probably time to get someone up on the roof and check the cables, boxes and antenna direction/polarisation. I would expect you would be on vertical polarisation off the skytower or Auckland infill in Orakei.
See installation instructions, the aerial is similar. 

Try Vultr using this link and get us both some credit:

6174 posts

Uber Geek
+1 received by user: 239


  Reply # 513036 28-Aug-2011 10:55
Send private message

Hi is there a power supply and power coupler on the TV socket anywhere in the house, if you look on the mast those two box are probably a diplexer/amp at the top and a splitter below, but you will need to send power up to the amp to get it to work. Are there any fittings attached to the TV sockets in the house.


21118 posts

Uber Geek
+1 received by user: 4208


  Reply # 513059 28-Aug-2011 12:41
Send private message

Top one will be a high pass filter that they were installing when installing amps for sky back in the day, because the amps were crap and would get massive interference from UHF walkietalkies being used.

The lower one will be an amp. Without sending AC up the cable to it, you will get virtually nothing out of it.

You need to get one of the kingray AC power injectors and put it on the cable to power up the amp, then you may get reception.

Most of the time when people moved to sky digital the installers would take away the power supply for the masthead amp, as it was now redundant for sky, and they had no obligation to leave you still able to recieve the other UHF channels if they installed the UHF antenna back in the day.


420 posts

Ultimate Geek
+1 received by user: 83

Chorus NZ

  Reply # 513171 28-Aug-2011 19:51
Send private message

You've certainly got duplication, the top box looks like a splitter, but only 1 input. The second looks like an amp or duplexer (?) splitting the signal out again (x2). One needs to go (prob the first at least).

If the second is an amp and you have no power supply, not only will you have no gain, it will actually kill the signal completely.

You need to provide more detail or get someone in.

6640 posts

Uber Geek
+1 received by user: 551


  Reply # 513282 29-Aug-2011 08:11
Send private message

Depending on many things, you may get some reception by just removing the amplifier from the circuit, if even just to test. This means getting out on the roof.

If you don't need multiple outlets in your house you could rewire it so that the aerial just feeds the one outlet you need directly, without a splitter and an amplifier in the circuit.

If you do need the amplifier, you can buy replacement power supply injectors for this from the likes of jaycar. You'd probably need to get up on the roof regardless to see if there is a part number etc for the amplifier, so you can select the right power supply for it.

Is there a sky satellite dish on the house somewhere too? - The f connector shown is common with satellite dishes and the aerial PAL plug is more common with TV aerials. Only the aerial plug will work with your TV.

18 posts


  Reply # 513437 29-Aug-2011 13:17
Send private message

Thanks for the replies, they are very helpful however I can't do much at the moment as I need to source a ladder to get up there. Once I get a chance, I'll have a play around and let you know how it goes.


1916 posts

Uber Geek
+1 received by user: 125

  Reply # 513508 29-Aug-2011 15:18
Send private message

donnsuil: Thanks for the replies, they are very helpful however I can't do much at the moment as I need to source a ladder to get up there. Once I get a chance, I'll have a play around and let you know how it goes.


To sort it all out we need to know what's in the boxes on the mast, where all the coax leads go and what connectors or leads are there in the house for TVs etc.
The aerial looks to be fairly new and should be fine but where is it pointing (Waiatarua, Sky Tower or Remuera)? As it's horizontal it should be pointing at Waiatarua or Remuera infill Tx. Sky Tower transmitter is vertically polarised.
If the bottom box is a Kingray masthead amp (and it looks like it) then it doesn't look to be setup correctly when I compare it with a spare one I have here. The two left side holes on bottom should be for VHF and UHF Antenna input coax (either one or both) and the one on the right should be coax out to TV via a power insertion connector somewhere behind the TV.
As for the top box it's anybody's guess. If you have just the UHF antenna then it doesn't seem to be serving any purpose. In fact I can't see any point in two boxes anyway.
The two plugs, as someone else said, one is for the TV and the other is an f type usually for a satellite box. Has there been a dish there somewhere that's been removed?
Let's know what you find.

21118 posts

Uber Geek
+1 received by user: 4208


  Reply # 513536 29-Aug-2011 16:21
Send private message

Its a GME kingray amp, only question is if it is a 4 output distribution splitter, or one that combines a VHF antenna as well.

AKAIK, but I am not 100% sure sky only ever supplied the UHF amp/diplexer models, so without power supply the VHF will all be fine, but UHF will get attenuated to almost nothing.

I might have one of the power supplies lying around here from a $1 box of junk I bought off trademe, I will have a look a little later.


Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08

Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03

Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27

Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13

Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00

Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12

Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52 to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34

Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07

All or Nothing: New Zealand All Blacks arrives on Amazon Prime Video
Posted 2-Jun-2018 16:21

Innovation Grant, High Tech Awards and new USA office for Kiwi tech company SwipedOn
Posted 1-Jun-2018 20:54

Commerce Commission warns Apple for misleading consumers about their rights
Posted 30-May-2018 13:15

IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12

New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17

Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.